Tool holder



Jan. 16, `1923'.

w. D. `L'0WE.

TOOL HOLDER.

FILED FEB. 2,'1921.

mmm? 'MHaYCJ Lonlwe, Y

Patented Jan. 16, 1923. i.

UNITED lSTATES TPA-TENT-oF-Ficu.

WILLARD n. Lowii, or COLUMBUS, omo.

Toon HOLDER.

Application med February 2,1921. serial No. 441,755.l

To all 'whom t may concern:

Be it known that WILLARD citizen of the United States, residing at Columbus, in the county vof Franklin and State of Ohio, has invented certain new and useful Improvements in Tool vHolders, of which the following is a specification.

This invention relatesto animproved supporting tool primarily designed for use in conjunction with end of a lathe dog rigidly carried adjacent to one end of a drill or reamer, the ,construcf tion being such that the oifset end fof the dog will engage with a shoulder provided` upon the L shaped extremityl of the-*supporting tool in such manner that the lrotation of the drill or reamer will be preventedand furthermore, the said end of the tool will be so disposed as to engage with one side of the dog in order that after the drill or reamer penetrates the work upon which it is performing the drill or reamer will be main'- tained in supported relation in connection with the traveling` carriage, and thereby prevented from rotating in conjunction with the work through which it is passed in order to overcome fracture on the part of thesaid drill or reamer.

For a further understandingof theinvention, reference is to be had to the following description and to the'accomp'anying drawing, in which similar characters of reference denote like and corresponding parts throughout the several views thereof. Y

In said drawings:

Figure 1 is a top plan view disclosing fragmentarily a portion of a lathe'andV illustrating the application thereto ofthe improved supporting-or holding tool comprising the ;-Present'invent-ion, f

D. LOWE, aH

an ordinary machine shop lathe for the purpose of supporting a drill the said ex- Figure isa sectional view taken along the -line 2 2 ofv Figure 1, and '1. i Figure 3 is a perspective viewy of thesupporting or holding tool.

Referring more pa'mti'cularly to theV details of the invention, the numeral lH designates generally an ordinary'standard form of a metal working lathe, of the' type commonly employed in machine shops. Thislathe is 0f customary construction and includes the usual stepped pulleys I2, a revolving work supporting head 3, a bed 4 and a longitudinally traveling-carriage 5, the latter being adaptedto support for movement inunison therewith a tool post 6 and acente'ring spindle 7, it being understood'l that any suite` able mechanism, commonjtolathes A*of this character, may be employed for 'shifting the carriage 5 and supplemental parts longitudinally" ofthe bed 4f.' The head 3 is adapted l tocarry in any suitable manner the work to be operated upon, and in this instance a metallic disk 8 has been shown in connection therewith. To produce any axial opening within the disk,the lathe is'equipped with a l drill 9, the latter being supportedyso that its rear end will engagewith the `center 7 of' the ytail stock and its forward orfcutting portions-will be disposed to engage andtol press intothe faceof thedisk 8. The drill y 9 'is adapted to| be stati'onarily supported, and by the rotation of theheadf and con'- sequentlythe work 8 and by the' longitudi# nal advancement' of the drill 9, eected from constantly forced into the workso, as to produce the desired l,opening therein; ,"Of course, a Vreamer incertain operations may be substituted for `the drill.`

the tail stock, the point of the drillwill lbe vIn operations of this nature it has'been L l a diflicult matter to hold the drill'against rotationl and to prevent the breakage or,v

damage ofthe drillandnthe ruin of the work upon which itis operating, after theI drill.

has penetrated through the body of the work and vproduced an opening therein. Machine shops have beenput to a large eX- pen'se simply fromfthe breaking of drills in operations of the above character and not only'the drills have'been damaged by fracture but also expensive pieces of work'have been ruined and rsacrificed by the breaking of the tools.v The fracture of the latter [has beeny mainly due ito the `insecuremethods hitherto provided for the purpose of properly supporting the drills. Ordinarily a lathe operator has simply relied upon the pressure exerted by the spindle 7 longitudinally upon the drill and the engagement of the forward end of the drillk with the work to maintain the drill in position. This manner of supporting a drill is practical so long as the pressure on the drill is applied, but obviously after the drill has penetrated the work the connection between the spindle 7 and the rear end of the drill is lost, and thus the drill is caused to rotate in conjunction with and to be supported by the work through which it is penetrated. When this condition exists it is very likely, and is a matter of common occurrence, that the drill will break immediately adjacent f to rthe work, and thus the value of the drill is lost and frequently the work is marred or destroyed lso that its value also is likely to be lost ordiminished.

The present invention, therefore, provides a holder primarily adapted for use in conjunction with 'a drill or reainer situated in the position above stated and capable of cooperating with the drill and the work supporting spindle or center so that the' drill will be properly supported at all times, even after penetrating the work, so that the likelihood of fracture of the drill and ldamage to the work will be reduced to a minimum. To this end, the rear endl of the drill 9, immediately adjacent to the spindle or center 7 is equipped with a lathe dog 10 of ordinary construction, the said dog being clamped in connection with the drill by means of the kordinary set screw l1, the latter being arranged to impinge against one side of the drill so as to force the latter into engagement with the converging side walls ofthe opening 12 provided through the dog for the reception of the drill. The dog 10 includes, as usual, the offset extremity 13, and this extremity is Aadapted to engage with the upper surface of a projection 15 provided upon one end of the holding or supporting tool 16 comprising the present invention. This tool inits preferred `form includes a longitudinally extending shank or body portion 17, which is adapted to be received in a transversely extendingopening 18 formed in the tool post 6 and by this construction to bey capable of being moved towardor away from the drill 9.' The post is provided with a vertically' disposed set screw 19, which vis situated to engage with the upper surface of the body 17 and to thereby retain the tool in its various positions of adjustment with respect to a drill. It will be observed that the normal tendency of the drill is to rotate in the direction indicated by the arrow 20, but this tendency on the part of the drill is overcome by the lathe dog 10, which is so situated that its means of a rib 22 and extends `mediately contiguous to extremity 13 will engage the rigid projection 15 formed with the tool body, thereby serving to retain the drill in connection with the spindle 7 and to avoid rotation on the part thereof.

yThe Ytool 516l is 'also formed to include a substantially L shaped extremity 21, which is suitably braced and strengthened by to a point imthe drill 9, and is disposed to engage with one side of the body of the lathe dog in such manner thatundue longitudinal movement yof the drill from its position of connection with" the end of the center 7 will bev prevented. V1t will `be'apparent that in operation ythe work 8 -is suitably connected with the head 3, thed'ogfl() is then connected with one end of the drill 9, and the tail stock is moved longitudinally so that the center 7 will be brought to press against one end of said drill, the other end of said drill being pressed into engagement 'l with the face of the work. rlhen, upon the rotation of the head together with the longitudinal advancement on the part of the tail stock and consequently the drill 9,the`latter will be forced into cutting engagement with the work so as to produce an opening or'bore therein. During the boring operation'sthe drill is held against rotation by the engagement of the extremity 18 of the lathe-dog with the projection 15, the work is thusjsecurely supported during the boringopera-` tion. However, after the boring has been completed there is always tendency on the part of a drill or. reamer to move longitudi- .nally away from the center 7, and to thus cause the fracture above mentioned. However, it will be observed that by the provision of the L shaped extremity 21 of the tool 16 such longii';udinalv movement on the part of the drill is effectively precluded andthus the shattering or breaking ofthe drill, from the cause mentioned, is overcome. Therefore, the present invention providesja idevice which is of simple construction capablel of being quickly and easily applied and by its use the life of a drill or other tool is materially prolonged and the expense incident f to shattered tools and destroyed work'isreduced to a minimum. rllhe tool 16 may be quickly and easily applied and will! not interfere with the normal lathe operator. Y

Vhat is claimed is:

movements,l of Vthe Y 1. A tool holder of the class described retaining the tool against longitudinal displacement.

dog, `Wherelojyth'e drill will lloe retained against rotation, grally projecting and an angular arni intel0 from .one end of the shank portion of said holder and arranged to eo operate with said dog to vmaintain the ydrill In testimony w against longitudinal displacement.

hereof l aiix mysi nature. 15

WILLALRDD; L WE. 

